61 lines
1.7 KiB
Ruby
61 lines
1.7 KiB
Ruby
require 'spec_helper'
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describe Gitlab::Metrics::Samplers::RubySampler do
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let(:sampler) { described_class.new(5) }
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let(:null_metric) { double('null_metric', set: nil, observe: nil) }
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before do
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allow(Gitlab::Metrics::NullMetric).to receive(:instance).and_return(null_metric)
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end
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describe '#sample' do
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it 'samples various statistics' do
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expect(Gitlab::Metrics::System).to receive(:memory_usage)
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expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
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expect(sampler).to receive(:sample_gc)
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sampler.sample
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end
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it 'adds a metric containing the memory usage' do
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expect(Gitlab::Metrics::System).to receive(:memory_usage).and_return(9000)
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expect(sampler.metrics[:memory_usage]).to receive(:set).with({}, 9000)
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sampler.sample
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end
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it 'adds a metric containing the amount of open file descriptors' do
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expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
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.and_return(4)
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expect(sampler.metrics[:file_descriptors]).to receive(:set).with({}, 4)
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sampler.sample
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end
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it 'clears any GC profiles' do
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expect(GC::Profiler).to receive(:clear)
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sampler.sample
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end
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end
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describe '#sample_gc' do
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it 'adds a metric containing garbage collection time statistics' do
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expect(GC::Profiler).to receive(:total_time).and_return(0.24)
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expect(sampler.metrics[:total_time]).to receive(:increment).with({}, 0.24)
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sampler.sample
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end
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it 'adds a metric containing garbage collection statistics' do
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GC.stat.keys.each do |key|
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expect(sampler.metrics[key]).to receive(:set).with({}, anything)
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end
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sampler.sample
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end
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end
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end
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